Blocking Between Roof Rafters

That blocking is then nailed to the wall top plate with three 8d nails per rafter space as prescribed in irc table 602 3 1.

Blocking between roof rafters.

And often in a humid environment. Each block is 2x4 or 2x6 depending on the size of the rafters and is secured to the top plate. Rotation loads on rafters occur when the roof sheathing is resisting lateral loads perpendicular to the rafter because these loads are actually trying to move the top edge of the rafter sideways. These connections could allow a greater uplift force to be resisted.

The blocking panels will provide additional connections between the roof trusses and the top plate of the wall. A truss to top plate connection consisting of three 16d box 3 long x 0 135 diameter nails is allowed to resist up to 200 pounds of uplift force per irc section. Inches 387 mm or less blocking between rafters or roof trusses shall be provided above the braced wall panel in accordance with figure r602 10 8 2 1. In my experience traveling across the country observing wood framed construction it was apparent that east of the rocky mountains structural wood members in line with supporting walls between roof framing cease to be installed.

The most direct load path is for the roof sheathing to be edge nailed to blocking between each rafter. This load path is shown in figure 6 4. Preventing rotation is typically accomplished by installing full depth blocking along wall plates between rafters and ceiling joists. Blocking or boundary member.